Three-tier architecture
Quick answer
Separation lets each tier scale and evolve independently: add application servers for more users, upgrade the UI without touching logic, and manage the database on its own terms.
Key takeaways
- A user action in the presentation layer is sent to a dialog work process on the application layer, which runs the relevant logic…
- Presentation: the user interface (GUI/Fiori); shows screens, captures input.
- Application: executes business logic in work processes; the brain of the system.
- Watch out: Collapsing the tiers mentally, they are distinct for good reasons.
The three tiers and their jobs
- Presentation: the user interface (GUI/Fiori); shows screens, captures input.
- Application: executes business logic in work processes; the brain of the system.
- Database: stores and retrieves all data; the single source of truth.
How a request flows
A user action in the presentation layer is sent to a dialog work process on the application layer, which runs the relevant logic, reads or writes data in the database layer, and returns the result to the screen. Understanding this flow makes performance analysis and troubleshooting far more logical.
Why three tiers
Separation lets each tier scale and evolve independently: add application servers for more users, upgrade the UI without touching logic, and manage the database on its own terms. It also isolates concerns, keeping the system maintainable at enterprise scale.
Common pitfalls
- Collapsing the tiers mentally, they are distinct for good reasons.
- Scaling the wrong tier for a given bottleneck.
- Ignoring the request flow when troubleshooting.
Want to learn this properly?
Our live, instructor-led SAP Training covers this hands-on, with real projects and a certification path.
Check your understanding
Which statement is true of Three-tier architecture?
- A. HANA security protects the database and its data through users, roles, privileges, encryption and auditing.
- B. Understanding this flow makes performance analysis and troubleshooting far more logical.
- C. Performance problems, slow transactions, reports or jobs, frustrate users and delay the business.
Show answer
B. Understanding this flow makes performance analysis and troubleshooting far more logical.
Covered in the “How a request flows” section of this lesson.
Which of these also applies to Three-tier architecture?
- A. It also isolates concerns, keeping the system maintainable at enterprise scale.
- B. Forgetting to regenerate the profile after role changes.
- C. Wrong RFC type for reliability needs.
Show answer
A. It also isolates concerns, keeping the system maintainable at enterprise scale.
Covered in the “Why three tiers” section of this lesson.
Which part of the Learn SAP curriculum covers Three-tier architecture?
- A. SAP SD
- B. SAP examples
- C. SAP architecture
Show answer
C. SAP architecture
This lesson sits in the SAP architecture section of the Learn SAP course.